Brake



July 10, 1934. G' F MICHAEL .BRAKE Filed Jan. 8, 1931 INVENTOR.

@U5 F, Mamma., BY

Patented July 10, 1934 o l'reo s'r-Arss PATNT olmos ARE Application January 8,

9 Claims.

This invention reiates to brakes and more par-1 ticularly to internal expanding brakes.

An object of the invention is to provide a brake generally known in the art as a single 5 mapping brake. This type of brake is very effestive for one way braking. This is particularly so in the present invention since the structure provides for a servo action when the drum is rotating counterclockwise.

an important feature of the invention is a bracket having a recess or cutaway poiton adaptable tot the reception of an operating cam. The bracket provides an adequate abutment or anchor for one end. of the friction element, the other end oi which engages the operating cam.

Another important feature of the invention is pivotal Wear plates on the anchoring and power applying ends of the iiiction element.

Stili a further important feature oi the invention is a .dried support on the backing plate havinf; means thereon tot' i'etaining the friction elements against lateral movement and yet pei:m nntting free circumferential or radial movements ioi engagement with the braking surface oi the @titer features of the invention include steady rests comprising a single stamping secured to the backing plate and adaptable to support the friction eiement against lateral movement in ei'- thei direction.

objects and ieaturesoi the invention appesi" from the following description taken in connection with the drawing, which forms a nett o1? tais sgoecication, and in which:

l is a vertical sectional View taken just of the head ci" the drinn illustrating the in -iion as appiied;

"Y is a sectional view substantially on l e E i a section substantialiy on tine tut,

use Ll is a section suhstantiadly on line LLL-fl,

to the drawing ioi' more speci-tic defA e of 'the invention, lo represents a fixed sugasuch as a backing plate. The backing plate associated therewith a rotate-bie drum i2. i'eositioned :for movement on the backing folate is a shoe is and a secondai'y shoe i. As shown, each shoe comprises a web it .automating nm :Bo ovine suitably secured thereto iining 22 adaptable :for cooperation with the braking of the drum.

@deported on the backing plate is a bracket it, portion 2o of which .is parallel to the baci:-

193i, Seix'iaiy No. 507,315

(Cl. ld- 78) V,ing plate l0. This portion is bent upon itself as indicated at 28 to provide a channel 30 in which is slidably positioned a block 32 comprising two corresponding plates between which is positioned a thrust block 3i having oppostely ing plate by steady rests 48. AEach. of the steady rests comprises a single stamping having one end riveted or otherwise secured on the backing plate as indicated at 5U and its other end bifurcated las at 52 to receive tite web of the friction elenient.

Positioned on the backing plate between the anchored end oi the shoes and the ooi-ver applying end of 'the siioes is a bracket 5t having a central *sore ed and a cutaway portion 58. Posi- V tioned in the here is a suitable bushing 6i) and positioned for rotation in the bushing is an opez-a ating shaft da This shaft has formed or secured theseon o cam 6d positioned in the cutaway goor-- tion 5S, the cani of; having a lobe-66 provided :danses o8 adapted' to straddle a wear plate 7o pivoted as indicated at 'i2 on the povvei applying end oi the shoes.

The bracket 54 has a slot 'ii positioned in the longitudinal plane of the operating com This slot receives a v/eazc plate id which has a slip joint connection with the web oi the secondary shoe id and notch i8 conforming to the rounded snouider to on the anchoring end oi the secu ondata shoe, so that this element may be iiee to move .vadis-ily and circumierentiaily foi' engagenient with biasing surface of the Positioned suhstantiaiiy in the diameter of the backing plate are fined suiopoets @Eend 84 connected :respectively by springs to and de to the piieiaiy and secondary shoes. These springs seive to tetten the shoes to the ofi position to setain their when in the ot? position iin-prone? asiatico to th braiding surface of the drum.

'tf'hiie ineieried embodiment-s oi the invention have been desciced, it is to beundesstood that these are given moiety as examples of the underiying principies oi the invention and since these may be incorporated in other specic mechanical structures, i do not intend to be limited to those shown, except as such limitations are cleaiiy imposed by the appended claims.

Having thus described the varus fea wies ci the mventon, what I claim as new and dszfi secure by Ilm-ters Patent is:

l. brake comprising ,a bracket having a cud-E portion m16; having' a; slot apposite the cu= away pori-ion, shaft pastiomec is? rotatcg, in the bac'rzet, a cam on me :allait Las stioned the cutaway portcn, f'cim means engaged by said cam "at om crd and am Charing agaznst 'me bfacet zd-movaey sem, l in said soi; ai; the @they brake @am i@ cl3-operate mism cmfe shmcf the anchored and Gf the frziem element :md

5. A brake wmmismg a ctw. eemet, a wear plat@ having mmgmjng plaies embraning the and ai the web of the zrictiam @ement between them, av thfm Maize msscnes intermedme the cTepfmdmg plates and means for pivots) Tv mounting the waspamdng plates on he of the frictim element.

G. A brake compa-sing a cre-mention fm: the dama?. @ms of afrcic-n alemania imcluclng ending mates am :3 plate 

